Hud vs dic speed difference

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Jan 24, 2017 | 10:29 PM

BROCKYJACK

Thread Starter

Burning Brakes

Joined: Dec 2013

Posts: 901

Likes: 45

From: Winter Haven FL

Hud vs dic speed difference

When I set my cruise control, the speed message that shows on the dic is always 1mph faster than the speed displayed on the HUD. Obviously they should be the same. Anybody else notice that? How would you sync them?

Jan 24, 2017 | 10:46 PM

MGMDET

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Joined: Dec 2016

Posts: 60

Likes: 16

From: Chesterfield Michigan

Quote:

Originally Posted by BROCKYJACK

Havent put many miles on her yet but I did notice the same exact thing. I'm going to hook up my laptop to it and see if I get exactly the same thing as the HUD, I'm assuming I will. But hoping someone says the answer is not needle adjustment like I'm guessing it will be. For the moment I'm not worried about the 1 mph I might be off as the officer is going to be much more concerned with the other 100mph I'm doing over the speed limit, and guessing he'll let me slide on the 1 mph difference if I beg.

Jan 24, 2017 | 10:48 PM

MGMDET

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Joined: Dec 2016

Posts: 60

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From: Chesterfield Michigan

But sleep easy sir, your OCD is completely understandable.

Jan 24, 2017 | 10:50 PM

C5 Dude

Instructor

Joined: Feb 2006

Posts: 151

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From: Portland, OR

Quote:

Originally Posted by MGMDET

But sleep easy sir, your OCD is completely understandable.

Jan 24, 2017 | 11:34 PM

jrose7004

Team Owner

Joined: Mar 2004

Posts: 58,500

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From: Oklahoma City OK

C6 of Year Finalist (appearance mods) 2019

I've never noticed a difference.

Jan 25, 2017 | 12:01 AM

Vet Interested

Le Mans Master

Joined: Oct 2005

Posts: 6,652

Likes: 2,106

From: Left Coast, San Diego

Quote:

Originally Posted by jrose7004

I've never noticed a difference.

There is....1mph.

Jan 25, 2017 | 12:02 AM

4SUMERZ

Race Director

Joined: Sep 2009

Posts: 11,338

Likes: 2,438

From: Eastern

I seldom ever look at the cluster, so I haven't noticed the difference if any from the HUD.

Jan 25, 2017 | 12:14 AM

Welker1

Melting Slicks

Joined: Jul 2015

Posts: 2,800

Likes: 565

From: Mesquite NV

Mine has been off by 1mph since the day I bought it new. One day for the heck of it, I set up my phone, GARMIN, built in NAV for a destination; once out on the interstate I set my cruise control to 80MPH.
Garmin, HUD & phone displayed 79mph; DIC & phone displayed 80mph ... talk about driving someone with OCD crazy

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Jan 25, 2017 | 01:00 AM

87SAM

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Joined: Jan 2001

Posts: 4,386

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From: Boise ID

Same 1mph difference since the C5.

Last edited by 87SAM; Jan 25, 2017 at 01:01 AM.

Jan 25, 2017 | 01:54 AM

#10

MGMDET

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Joined: Dec 2016

Posts: 60

Likes: 16

From: Chesterfield Michigan

That's it! Selling the car

Jan 25, 2017 | 07:59 AM

#11

hankenstine

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Joined: Jan 2016

Posts: 93

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From: Dayton OH

My corvette and my
Wife's camaro both do this don't know why maybe just a gm thing

Last edited by hankenstine; Jan 25, 2017 at 07:59 AM.

Jan 25, 2017 | 08:09 AM

#12

Corvette_Ed

Race Director

Joined: May 2012

Posts: 15,759

Likes: 3,277

From: Phoenix area, AZ

Mine does the same, although I have seen them match occasionally. I just assumed the difference is most likely due to the tenths of MPH that the display on the HUD doesn't recognize, and that the DIC rounds up to account for, while the HUD doesn't round at all.

Jan 25, 2017 | 08:35 AM

#13

NashvilleGrandSport

Melting Slicks

Joined: Jul 2015

Posts: 2,255

Likes: 781

From: Nashville TN

And I thought I was the only one!

Last edited by NashvilleGrandSport; Jan 25, 2017 at 08:35 AM.

Jan 25, 2017 | 08:40 AM

#14

extrapilot

Melting Slicks

Joined: Dec 2013

Posts: 2,232

Likes: 315

From: Bridgewater New Jersey

At least they are consistently 1 mph off..I can live with that...

Jan 25, 2017 | 08:53 AM

#15

yellowvette1992

Racer

Joined: Mar 2005

Posts: 299

Likes: 7

From: Oregon City Oregon

Noticed the same thing with my 06

Jan 25, 2017 | 09:46 AM

#16

PAULEB07

Drifting

Joined: Nov 2011

Posts: 1,777

Likes: 309

From: Long Island, N.Y.

Let's call GM and complain! This should be a recall!

Mine does the same!

Jan 25, 2017 | 10:04 AM

#17

dr_gallup

Safety Car

Joined: Feb 2016

Posts: 4,425

Likes: 1,377

From: SC

This is unacceptable! Actually, never noticed it but I don't normally display speed on the DIC. When I set the cruise, it temporarily displays the setting on the DIC and that matches the HUD and my Garmin. Does the factory NAV even display speed?

Now I'm going to have to delve more closely into this. Good thing I drove the GS today.

Jan 25, 2017 | 10:37 AM

#18

RicK T

Team Owner

Joined: Sep 2005

Posts: 20,352

Likes: 568

From: Ventura County, Calif

The reason is that the HUD always rounds speeds down by truncating, while the DIC rounds correctly, ie: down if xx.5 or less and up if more than xx.5.